JPS5517825A - Music-interval detector for record player - Google Patents

Music-interval detector for record player

Info

Publication number
JPS5517825A
JPS5517825A JP8888578A JP8888578A JPS5517825A JP S5517825 A JPS5517825 A JP S5517825A JP 8888578 A JP8888578 A JP 8888578A JP 8888578 A JP8888578 A JP 8888578A JP S5517825 A JPS5517825 A JP S5517825A
Authority
JP
Japan
Prior art keywords
record
light emitting
emitting diode
output
reflected
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP8888578A
Other languages
Japanese (ja)
Inventor
Minoru Yoshioka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pioneer Corp
Original Assignee
Pioneer Electronic Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Priority to JP8888578A priority Critical patent/JPS5517825A/en
Publication of JPS5517825A publication Critical patent/JPS5517825A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To make a fixed output generate to prevent error operation of a music interval detector in spite of up-and-down vibration of a record, which is generated by the deformation of the record or its equivalent during the rotation of record, by setting photo-detecting means and the 1st and 2nd light emitting diodes in the neighborhood of the needle point of pick-up arm.
CONSTITUTION: The 1st light emitting diode 2a is set so that the output of photo detector 3, which corresponds to the reflected light reflected on the surface of record 8 located on the 1st position separated distance l1 from 1st light emitting diode 2a, may reach max. value. The 2nd light emitting diode 2b is set so that the output of photo detector 3, which corresponds to the reflected light reflected on the surface of record 8 located on the 2nd position separated distance l2 from the 2nd light emitting diode 2a, may reach max. value. Therefore, photo detector 3 can generate fixed output C within the range between distance l1 and l2 even when record 8 vibrates up-and-down by the reasons such the deformation of record during the rotation of record.
COPYRIGHT: (C)1980,JPO&Japio
JP8888578A 1978-07-20 1978-07-20 Music-interval detector for record player Pending JPS5517825A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8888578A JPS5517825A (en) 1978-07-20 1978-07-20 Music-interval detector for record player

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8888578A JPS5517825A (en) 1978-07-20 1978-07-20 Music-interval detector for record player

Publications (1)

Publication Number Publication Date
JPS5517825A true JPS5517825A (en) 1980-02-07

Family

ID=13955430

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8888578A Pending JPS5517825A (en) 1978-07-20 1978-07-20 Music-interval detector for record player

Country Status (1)

Country Link
JP (1) JPS5517825A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57203255A (en) * 1981-06-08 1982-12-13 Pioneer Electronic Corp Intermusic detector of record player
JPS623462A (en) * 1985-06-28 1987-01-09 Matsushita Electric Ind Co Ltd Reflecting type sensor for music selecting record player

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57203255A (en) * 1981-06-08 1982-12-13 Pioneer Electronic Corp Intermusic detector of record player
JPS623462A (en) * 1985-06-28 1987-01-09 Matsushita Electric Ind Co Ltd Reflecting type sensor for music selecting record player

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